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Excel file working fine in Excel 2016 opens with #Name error in 2010

I have an Excel file that works fine with my Office 365 but when opened up on Excel 2010 appears with a Name# error. I am not using any brand new functions like Xlookup or unique. Any ideas? Thanks
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Subodh Tiwari (Neeraj)
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#Name error means Excel doesn't recognize the function you are using.
What function you are using?
Please make sure that you haven't misspelled the function name.
did you have a named range when opened in O365?
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agwalsh

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The function I was using was Sumifs and it's working perfectly on my computer so I am not getting a Name#error.  I just checked with them and they have SUMIFS on their computer.  @E C - they have a number of named ranges but I've been using Sumifs on this for the last year and it was only when I upgraded a formula to add in another sumifs that they started getting this message.
your 2010 Excel - is it 32 but or 64 bit? If it’s a large spreadsheet maybe the 32 bit 2010 can’t handle the number of rows or columns?
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I opened up the file in Excel 2010 and it now says {=_xlfn.Single( everywhere I had sumifs...
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Subodh Tiwari (Neeraj)
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Went back and recreated all the formulas. I found that all of a sudden @ was appearing in front of functions. So I had to delete all those and re-do the formulas. That worked.  Thank you as always
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Thank you to everyone who helped. I really appreciated it. Had to recreate the formulas over 10 sheets...
You're welcome!
You could have tried using Find & Replace to change the formulas
I realize that the question has already been "answered" but the real problem is that you are running Excel 2016/Office 365 and are also an Office Insider. Some, but not all, of the Office Insiders are getting the new dynamic array feature. That's where the @ and xlfn Single are coming from.

With dynamic arrays, you no longer need to Control Shift Enter your array formulas. Excel with dynamic arrays figures out whether a function parameter is being overloaded with an array. For backwards compatibility, Excel adds the @ and xlfn.Single to indicate that a function which could return an array is actually returning only a single value.

If you delete one or more of these @ or xlfn.Single, you may get a #NAME? error when you open the workbook in an older version of Excel.

Throwing a #NAME? error is not particularly helpful to the user. I suggest sending a frown over the issue. You do this using the "smiley face" icon at the far tight of every ribbon (or by using the Help...Feedback menu item).